In order to solve uncertainties such as the boundary delimitation of the assessment system and the difficulty in identifying core element, taking Shandong renewable energy policy as a case, the application of the combined tool of life cycle assessment (LCA) and scenario analysis in the environmental impact assessment of renewable energy policy were discussed. The results showed that the combination of LCA and scenario analysis tools could reduce the uncertainty of renewable energy policy EIA and improve the decision-making ability when comparing and selecting optimization schemes. In order to achieve the consistency between policy implementation and EIA, it was necessary to conduct the follow-up evaluation based on policy EIA.